package com.naicheng.ivote.utils;

import java.util.Stack;

import android.app.Activity;
import android.app.ActivityManager;
import android.content.Context;


public class AppManager {

	public static Stack<Activity> activityStack;
	public static AppManager instance;

	private AppManager() {
	}

	/**
	 * 单一实例
	 */
	public static AppManager getAppManager() {
		if (instance == null) {
			instance = new AppManager();
		}
		return instance;
	}

	/**
	 * 添加Activity到堆栈
	 */
	public void addActivity(Activity activity) {
		if (activityStack == null) {
			activityStack = new Stack<Activity>();
		}
		if (!activityStack.contains(activity)) {
			activityStack.add(activity);
		}
	}

	/**
	 * 返回到指定的Activity并且清除Stack中其位置上的所有Activity
	 * 
	 * @param clz
	 *            指定的Activity
	 * @return 该Activity
	 */
	public Activity getTopWith(Class<?> clz) {
		Activity resAc = null;
		int postion = 0;
		if (null != clz) {
			if (null != activityStack && activityStack.size() > 0) {
				for (int i = 0; i < activityStack.size(); i++) {
					if (activityStack.get(i).getClass().getName().contains(clz.getName())) {
						postion = i;
					}
				}
				int num = activityStack.size() - postion - 1;
				if (num > 0) {
					for (int i = 0; i < num; i++) {
						if (!activityStack.empty()) {
							finishActivity(activityStack.pop());
						}
					}
				}
			}
		}
		return resAc;
	}

	/**
	 * 获取当前Activity（堆栈中最后一个压入的）
	 */
	public Activity currentActivity() {
		Activity activity = activityStack.lastElement();
		return activity;
	}

	/**
	 * 结束当前Activity（堆栈中最后一个压入的）
	 */
	public void finishActivity() {
		Activity activity = activityStack.lastElement();
		finishActivity(activity);
	}

	/**
	 * 结束指定的Activity
	 */
	public void finishActivity(Activity activity) {
		if (activity != null) {
			activityStack.remove(activity);
			activity.finish();
			activity = null;
		}
	}

	/**
	 * 结束指定类名的Activity
	 */
	public void finishActivity(Class<?> cls) {
		for (Activity activity : activityStack) {
			if (activity.getClass().equals(cls)) {
				finishActivity(activity);
			}
		}
	}

	/**
	 * 结束所有Activity
	 */
	public void finishAllActivity() {
		for (int i = 0, size = activityStack.size(); i < size; i++) {
			if (null != activityStack.get(i)) {
				activityStack.get(i).finish();
			}
		}
		activityStack.clear();
	}

	/**
	 * 判断所有的Activity是否处于onStop状态
	 */
	public boolean isOnStop() {

//		for (int i = 0; i < activityStack.size(); i++) {
//			BaseActivity activity = (BaseActivity) activityStack.get(i);
//			/*if (!activity.isActivityStatus()) {
//				return false;
//			}*/
//		}

		return true;

	}

	/**
	 * 退出应用程序
	 */
	public void AppExit(Context context) {
		try {
			finishAllActivity();
			ActivityManager activityMgr = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
			activityMgr.restartPackage(context.getPackageName());
			System.exit(0);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}